Answer
Please see the work below.
Work Step by Step
We know that
$Q=mc\Delta T$
This can be rearranged as:
$c=\frac{Q}{m\Delta T}$
We plug in the known values to obtain:
$c=\frac{7500}{(1)(3.0)}$
$c=2500\frac{J}{Kg \space C}$
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